Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 150/80-15 | 120/90-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.45 (621) | 26.5 (673.2) | 2.06 (52.2) 8.4% |
| Width inches (mm) | 5.91 (150) | 4.72 (120) | -1.18 (-30) -20% |
| Circum. inches (mm) | 76.81 (1950.93) | 83.26 (2114.92) | 6.46 (163.99) 8.4% |
| Sidewall Height inches (mm) | 4.72 (120) | 4.25 (108) | -0.47 (-12) -10% |
| Revolutions per mile (km) | 824.91 (512.58) | 760.95 (472.83) | -63.96 (-39.75) -7.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.68 mph (34.89 km/h) |
| 25 mph (40.23 km/h) | 27.1 mph (43.62 km/h) |
| 30 mph (48.28 km/h) | 32.52 mph (52.34 km/h) |
| 35 mph (56.33 km/h) | 37.94 mph (61.06 km/h) |
| 40 mph (64.37 km/h) | 43.36 mph (69.79 km/h) |
| 45 mph (72.42 km/h) | 48.78 mph (78.51 km/h) |
| 50 mph (80.47 km/h) | 54.2 mph (87.23 km/h) |
| 55 mph (88.51 km/h) | 59.62 mph (95.95 km/h) |
| 60 mph (96.56 km/h) | 65.04 mph (104.68 km/h) |
| 65 mph (104.61 km/h) | 70.46 mph (113.4 km/h) |
| 70 mph (112.65 km/h) | 75.88 mph (122.12 km/h) |
| 75 mph (120.7 km/h) | 81.3 mph (130.85 km/h) |
| 80 mph (128.75 km/h) | 86.72 mph (139.57 km/h) |
| 85 mph (136.79 km/h) | 92.14 mph (148.29 km/h) |
| 90 mph (144.84 km/h) | 97.57 mph (157.02 km/h) |
| 95 mph (152.89 km/h) | 102.99 mph (165.74 km/h) |
| 100 mph (160.93 km/h) | 108.41 mph (174.46 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1936 | 2250 | 2423 | 2530 | 2645 | 2728 | 2818 | 2925 | 3074 | 3222 | 3387 | 3519 | 3758 | 4021 | 4227 | 4359 | 4433 | 4705 | 5084 | 5908 |
Better Fuel Economy Factory Ratios Increased Power
